Meanwhile, the NSW Ambulance Service is urging rockfishers to be wary of the gusty conditions.

"Given there is a strong wind warning for tomorrow, we would particularly like to put the message out there to those who are considering rock fishing to think twice and check the forecast before heading out," the service said in a statement.

"Unfortunately, paramedics are called to treat rock fishermen who are swept off the rocks by large waves on days with conditions similar to those expected tomorrow."

The dangerous fire conditions follow a sweltering day on Thursday where temperatures reached 37 degrees in southern parts of NSW.

Firefighters said immaculate planning and co-operation from the public helped prevent a potentially catastrophic bushfire emergency.